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The Clinical Pharmacologic Profile of Reboxetine

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The Clinical Pharmacologic Profile of Reboxetine Journal of Affective Disorders 51 (1998) 313±322 Research report The clinical pharmacologic pro®le of reboxetine: does it involve the putative neurobiological substrates of wellbeing? David Healya,* , Helen Healy b aNorth Wales Department of Psychological Medicine, Hergest Unit, Bangor LL57 2PW, UK bInstitute for Medical and Social Care Research, University of Wales, Bangor, UK Abstract Following a review of the clinical trials of reboxetine, a new nonadrenegic reuptake inhibitor antidepressant, this paper presents a heuristic theoretical framework to better understand selective antidepressant action. For over three decades, the dominant views of antidepressant action have seen these agents active across all constitutional types and regardless of social setting. An increasing number of studies using quality of life methods are at odds with this view. This paper summarizes several of these studies, along with two studies of the effects of reboxetine on the quality of life, which reveal differential effects of selective agents that demand alternative explanations to the conventional monoamine theories. The authors submit that any revisions in our understanding of what is happening will have to pay attention to temperamental inputs that antedate affective episodes and to the sense of wellbeing and level of residual symptoms patients have on treatment after the acute phase of their illness has remitted. Obviously much more research needs to be done in this area. This invited paper sketches out, in very general terms, some provocative possibilities of how future understanding of antidepressants, temperament and their neurobiologic substrates could lead to better matching of speci®c antidepressants to speci®c temperament types. 1998 Elsevier Science B.V. All rights reserved. Keywords: Antidepressant; Reboxetine; Monoamine theories; Temperament; Quality of life 1. Introduction either more mood enhancing or more anxiolytic (Kielholz, 1968; Healy, 1997). The implication was In the mid 1960s, Paul Kielholz surveying the then that the range of different antidepressants embodied available antidepressants, suggested that some de- a number of different therapeutic principles. Two pressed individuals get well by enhancing drive, important developments supervened which tended to while others help by doing something else which was obscure the recognition of possible differences. One was the emergence of the monoamine theories of *Corresponding author. Tel.: 1 44-1248-384452; fax: 1 44- depression (Schildkraut, 1965; Bunney and Davis, 1248-371397. 1965), which posited a common catecholamine E-mail address: healy [email protected] (D. Healy) ] lesion in mood disorders, which all antidepressants, 0165-0327/98/$ ± see front matter 1998 Elsevier Science B.V. All rights reserved. PII: S0165-0327(98)00227-4 314 D. Healy, H. Healy / Journal of Affective Disorders 51 (1998) 313 ±322 regardless of their therapeutic class, acted to correct. recently the focus has been on 5HT-1a receptors The second was the adoption of rating scales such as (Artigas et al., 1994). Functional differences between the Hamilton Depression Rating Scale (HDRS) and the SSRIs and other antidepressants, on either a the Beck Depression Inventory, reinforcing the im- physiological or on a behavioral level, have been pression that one was measuring the speci®c symp- ignored in favour of views which emphasize cross- toms of a discrete disorder or disease entity (Healy, talk between monoamine systems (Manier et al., 1998a). 1984). The catecholamine hypothesis was quickly com- Clinically, the SSRIs were quickly compared with plemented by an indoleamine hypothesis (Coppen, the tricyclic antidepressants (TCAs) from the points 1967 and 1972). This gave rise to the possibility that of view of safety in overdose and freedom from there might be catecholaminergic and serotonergic side-effects, such as excess sedation and weight gain. depressions. This issue was investigated extensively This pro®le of effects made them more suitable for through the 1970s and early 1980s without a clearcut wider use in primary care depressive disorders than conclusion (Maas et al., 1984). Subsequent work the TCAs had been. The area of primary care mood with tryptophan-depletion and AMPT-challenge disorders, which almost certainly embraces a range paradigms, however, has pointed to distinctive roles of conditions, in which there are varying phar- for the calecholamine and serotonin systems in mood macogenetic, temperamental and psychosocial in- disorders (Delgado et al., 1991 and 1993). This body puts, provides possibilities for investigations with of work has generally been interpreted in terms of antidepressants of different pharmacological pro®les. discrete monoamine lesions, despite the fact that To date, these possibilities have not been addressed, evidence of biochemical differences between sub- owing in part to the side-effect pro®le of the older jects and differential responses to antidepressants TCAs. The emergence of a selective norepinephrine might just as well stem from temperamental differ- reuptake inhibitor, reboxetine, which is neither seda- ences between subjects. Also consistent with a tive nor associated with weight gain and which is temperamental view of mood disorders, Delgado and safe in overdose (Montgomery, 1997), might help us colleagues have noted that their ®ndings may speak obviate some of these problems. It is now, in primarily to a role for catecholamines or serotonin in principle, possible to begin to examine the effects of the action of selective antidepressants rather than as different therapeutic interventions against a back- evidence of a monoamine lesion. ground of differing temperament types, different Faced with Kielholz's schema, Arvid Carlsson pharmacogenetic pro®les and different comorbidities, suggested that those agents which were drive en- in a way that has been impossible hitherto. hancing had preferential actions on catecholamine systems and those that were doing something else acted on the serotonin (5HT) system (Carlsson et al., 2. Reboxetine: pharmacological pro®le 1969; Carlsson, 1996). This insight ultimately led to the creation of the 5HT Reuptake Inhibitors (SSRIs), Reboxetine is a selective norepinephrine reuptake of which zimelidine, in 1971, was the ®rst patented inhibitor derived from viloxazine. Unlike previous and indalpine, in 1978, was the ®rst released into norepinephrine reuptake inhibitors, clesipramine, clinical use. A subsequent generation of SSRIs came maprotiline and lofepramine, it has no signi®cant into clinical practice from about the mid-1980s. effects on histaminic or cholinergic receptors or on Despite the fact that the SSRIs were only developed adrenergic receptors other than the norepinephrine because antidepressants differed in their functional reuptake site (Brunello and Racagni, 1998). effects and although they embodied a selective In animal studies the potential antidepressant therapeutic principle, the dominant views of the day activity of reboxetine was ®rst brought to light in the continued to see all antidepressants as somehow 1980s by its antagonism of reserpine-induced hypo- acting on some ®nal common pathway. From 1975 thermia and blepharospasm (Melloni et al., 1984), as through to 1985, this was beta adrenoceptor dow- well as antagonism of clonidine-induced hypother- nregulation (Vetulani et al., 1996), while more mia (Melloni et al., 1984). Indeed its antagonism of D. Healy, H. Healy / Journal of Affective Disorders 51 (1998) 313 ±322 315 clonidine-induced hypothermia was more rapid than greater effects in areas of motivation than a drug that with available tricyclic antidepressants, suggest- active on 5HT systems (Dubini et al., 1997; Bosc et ing that it might have a faster rate of onset than ether al., 1997). The SASS derives originally from assess- antidepressants; it prevented clonidine-induced hypo- ments of social functioning by Myrna Weissman and thermia after a single dose, where chronic dosing Eugene Paykel in the mid-1970s, which led to the was needed with the tricyclic antidepressants. development of a social adjustment scale (SAS) Reboxetine appears to be devoid of signi®cant (Weissman et al., 1974; Weissman, 1997). The inhibitory effects on common cytochrome P450 original Weissman-Paykel approach involved obser- enzyme systems (Dostert et al., 1997). In humans, its ver-based assessments of social functioning. Asses- half life is approximately 13 h, permitting single sing the area of social adjustment/social function daily dosage, although it has been studied in clinical through self-report produces a scale that overlaps trials in a b.i.d regime. Unlike the tricyclic antide- heavily with many quality of life scales. This area is pressants, the recommended dose 8 mg per day can clearly of importance as there are indications that be given on initiating therapy. The drug, therefore, patient perceptions of well being as assessed by appears suitable for use in primary care by virtue of quality of life measurements may predict the stability its dose regimen and its low liability for drug±drug of clinical response in the longer term (Thunedborg interactions. It is also potentially suitable for use in et al., 1995) The SASS was validated in French combination with other psychotropic agents, by samples. While Danish, Finnish, English and Spanish virtue of its lack of 5HT-reuptake inhibiting prop- versions now exist, it remains to be established that erties as well as the lack of signi®cant monoamine- these
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